Shampoo basin



FIG. 1 is an isometric view of a shampoo basin showing my new design;

FIG. 2 is a right side elevational view thereof, the left side being amirror image of the right side shown;

FIG. 3 is a rear elevational view thereof; and

FIG. 4 is a bottom plan view thereof.

The ornamental design for a shampoo basin, as shown and described.